1, first of all the files in the U disk backup good, because the U disk speed will be automatically formatted U disk;
2. Then press "Win+r" key in the keyboard to open the "Run" window, enter "cmd" and press ENTER to open "Command Prompt" window;
3. In the Open Command Prompt window, enter the command "Chkdsk g:", carriage return execution, (Ps:g is currently inserted in the computer of the U-disk letter, the user to be based on a USB drive to fill);
4, this time the calibration test after the U-disk, we can see the allocation unit is "4096 bytes", PS: usually this allocation unit value is the default is 4096 bytes;
5, then enter "format g:/a:16k" at the cursor press ENTER, the same as above the G is the U disk drive letter;
6, the prompt to insert a new disk, if you have inserted the U-disk, press ENTER to execute, waiting for the initialization of the verification test file allocation table complete.
7, the completion of the initial verification test file allocation table, press ENTER to continue, this time the allocation unit will be displayed as "16384 bytes", and finally close the Command prompt window is OK.